Hello Simone, at first, let me thank you for your answer. Ok for the storage domain. I have already done this before. The storage domain is a glusterfs domain. The glusterfs volume is composed of 3 hosts which are managed from the 1st engine. I wanted the detach the hosts, vm, storage domain from that engine and import everything on a new engine without loosing gluster volume info These are the steps I would like to do - stop all the VM - put into maintenance the storage domain - detach the storage domain from the datacenter - put all the host into maintenance - remove every host from the datacenter On the new engine: - create a new datacenter, cluster - add the host from the old datacenter (which does have glusterfs's conf) to the cluster - import the storage domain - import the VM from that storage domain Well I think I have to give a try on a test platform. Any advice about those steps ?